Mg2Ni was synthesized by a solid state reaction from the constituent elemental powder mixtures via mechanical alloying. The mixture was ball milled for 10 h at room temperature in an argon atmosphere. The high energy ball mill used here was fabricated at ININ. A hardened steel vial and three steel balls of 12.7 mm in diameter were used for milling. The ball to powder weight ratio was 10:1. A small amount of powder was removed at regular intervals to monitor the structural changes. All the steps were performed in a little lucite glove box under argon gas, this glove box was also constructed in our Institute. The structural evolution during milling was characterized by X-ray diffraction and scanning electron microscopy techniques. The hydrogen reaction was carried out in a micro-reactor under controlledconditions of pressure and temperature. The hydrogen storage properties of mechanically milled powders were evaluated by using a TGA system. Although homogeneous refining and alloying take place efficiently by repeated forging, the process time can be reduced to one fiftieth of the time necessary for conventional mechanical milling and attrition.
In this paper, we report the results obtained from different phases of metal hydrides. The synthesis and characterization of tantalum hydrides were obtained "in situ" during mechanical milling. Elemental Ta with purity of 99.8% was used in this investigation to obtain the hydrides. A highenergy ball milling technique was utilized to prepare hydrogenated phases. Ta hydrides and oxides were formed as function of milling process time. Milling times of 5, 10 and 20 hours were programmed, and the ball-to-powder weight ratio was 10:1. The material was first characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Before and after hydrogenation process the material was also analyzed by TGA. X-ray diffraction analysis demonstrated that only tantalum hydrides (Ta2H and TaH0.5) were obtained after 20 h of milling. We will discuss the effect of the ball-milling process about formation "in situ" of nanometric tantalum hydrides with methanol as a hydrogen source.
In this work the synthesis of intermetallic Mg 2 Cu is presented. Elemental particles of magnesium with a purity of 99.8% and Cu 99.9% were mixed in desired quantity to reach a nominal composition of 40-60 and 80-20 wt% for magnesium and copper in each composition respectively. The synthesis of compound was carried out by mechanical alloying technique with a high energy ball mill type spex which was constructed in our Institute. Then Mg and Cu particles were put into a stainless steel vial and three stainless steel balls and methanol as milling media and process control agent respectively. The ball to particles weight ratio was 10:1. The milling time was defined only between 1 to 5 h, at room temperature. This technique was used because the conventional method of thermal fusion could not be induced to synthesize this alloy. The metal powders were
Original Research Articleanalyzed before and after milling by X-ray diffraction and scanning electron microscopy (SEM). The results obtained by XRD shows the formation only of Mg 2 Cu phase in short milling time in both compositions. These results show that due to the high impact between milling media, material and control agent can be obtained this alloy easily and fast by mechanical alloying technique.
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